| commit | 4c490f3d321da415b8d3bec4a04565906657b9c9 | [log] [tgz] |
|---|---|---|
| author | SZEDER Gábor <szeder.dev@gmail.com> | Thu Oct 11 11:53:57 2018 +0200 |
| committer | Junio C Hamano <gitster@pobox.com> | Fri Oct 12 07:23:29 2018 +0900 |
| tree | 7edae412d7a71f336293e5cdee3c13d9c6be28b3 | |
| parent | 5581a019ba0a53ea2b69d477d395590f7aba257c [diff] |
split-index: BUG() when cache entry refers to non-existing shared entry
When the split index feature is in use, then a cache entry is:
- either only present in the split index, in which case its 'index'
field must be 0,
- or it should refer to an existing entry in the shared index, i.e.
the 'index' field can't be greater than the size of the shared
index.
If a cache entry were to refer to a non-existing entry in the shared
index, then that's a sign of something being wrong in the index state,
either as a result of a bug in dealing with the split/shared index
entries, or perhaps a (potentially unrelated) memory corruption issue.
prepare_to_write_split_index() already has a condition to catch cache
entries with such bogus 'index' field, but instead of calling BUG() it
just sets cache entry's 'index = 0', and the entry will then be
written to the new split index.
Don't write a new index file from bogus index state, and call BUG()
upon encountering an cache entry referring to a non-existing shared
index entry.
Running the test suite repeatedly with 'GIT_TEST_SPLIT_INDEX=yes'
doesn't trigger this condition.
Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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